CN103275725A - Chemical fixing agent for heavy metal contaminated soil remediation and preparation and application thereof - Google Patents
Chemical fixing agent for heavy metal contaminated soil remediation and preparation and application thereof Download PDFInfo
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- CN103275725A CN103275725A CN2013102249974A CN201310224997A CN103275725A CN 103275725 A CN103275725 A CN 103275725A CN 2013102249974 A CN2013102249974 A CN 2013102249974A CN 201310224997 A CN201310224997 A CN 201310224997A CN 103275725 A CN103275725 A CN 103275725A
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Abstract
The invention provides a chemical fixing agent for heavy metal contaminated soil remediation and a preparation and an application thereof. the preparation method comprises the following steps: 1) using titanium dioxide waste residue as a raw material, stirring while adding phosphate and an alkaline substance into a solution successively, and adjusting pH to alkaline; and 2) adding an oxidizing agent into a mixed liquor, fully stirring, reacting for 60-120min, filtering, drying the residue at 50-80 DEG C, grinding and sieving through a 20-mesh sieve so as to obtain a heavy metal fixing agent. The heavy metal fixing agent is added into lead-cadmium contaminated soil according to the mass ratio of 5%. Effective state cadmium and lead fixed rates reach 34-43% and 41-48% respectively. According to the heavy metal fixing agent provided by the invention, industrial solid wastes are fully utilized, and the preparation process is simple and requires low cost. In addition, the fixing agent prepared by the preparation method has a good effect of fixing heavy metal and can be used for lead-cadmium contaminated soil remediation.
Description
Technical field
The present invention relates to a kind of chemical fixatives product for restoration of soil polluted by heavy metal, the preparation method with and application in heavy-metal contaminated soil is repaired.
Background technology
Soil is mankind's physical environment of depending on for existence and the valuable source of agriculture production.Yet environmental pollution and ecological damage are increasingly serious, badly influence human beings'health and existence, and wherein heavy metal element is particularly serious to pollution and the destruction of environment, and heavy metal pollution of soil and reparation thereof have become the emphasis of current environment scientific research.
Heavy-metal contaminated soil reparation at present mainly contains several big class methods such as physics, chemistry, biology.The physics reparation mainly is the soil moved in to improve the original method, and this method is applicable to small area severe contamination soil, but must administer the soil that swaps out.This method expends substantial contribution, man power and material, and the contaminated soil of excavating is easy to cause pollution again.The biological restoration method mainly is plantation heavy metal tolerance plant and heavy metal super-enriched plant.The phytoremediation technology of contaminated soil is because its lower cost and environmentally friendlyly caused numerous concerns.Yet super enriching plant has features such as poor growth, biomass is low, growing environment is special, is difficult to satisfy the demand of economy and environment, and usually is subjected to the restriction of local climate condition and available plant species.It is more with respect to cadmium that microbial method is handled plumbous research, but all be not widely used.Chemistry reparation mainly comprises drip-rinsing process, extraction method, solidification method, electrochemical method, uses modifying agent method etc.Advantages such as wherein chemical fixation has that applied widely, processing capacity is big, the method means are many, instant effect, effect are remarkable are so have application promise in clinical practice.Especially for the pollution of area source that causes in the agriculture production activity, the chemical fixation repairing method can satisfy better administers the requirement that heavy metal in soil pollutes.Chemical fixation is exactly by add organic matter, natural mineral, lime, organic reagent etc. in soil, regulate and the physicochemical property of change heavy metal in soil, make it produce precipitation, absorption, ion-exchange, humify and oxidation/series reaction such as reduction, reduce its biological effectiveness and transportable property in edatope, thereby reduce these heavy metals to vegeto-animal toxicity.There is following problem in the common chemical fixing agent at present: (1) natural mineral type fixing agent is to the fixed efficiency low (usually in 30%) of heavy metal; When (2) organic class fixing agent is used for the heavy-metal contaminated soil reparation, there is secondary pollution; (3) lime class fixing agent normally changes soil pH and makes heavy metal form oxyhydroxide and carbonate precipitation, in case the envrionment conditions development changes, heavy metal discharges easily again, and especially in the serious area of acid rain, this situation often has generation.Therefore, preparation good fixing effect and eco-friendly heavy metal fixing agent become the gordian technique difficult problem that China's heavy-metal contaminated soil is repaired.
Summary of the invention
First purpose of the present invention is for providing low, effective, eco-friendly fixing agent of repairing for heavy-metal contaminated soil of a kind of cost and preparation method thereof.
Second purpose of the present invention provides the application of described fixing agent in heavy-metal contaminated soil is repaired.
A kind of preparation method of chemical fixatives of repairing for heavy-metal contaminated soil may further comprise the steps:
(1) with titanium dioxide waste residue dissolving water, is made into and contains ferrous iron solution;
(2) add in phosphoric acid and the phosphate solution one or more in the above-mentioned solution, add alkali while stirring, regulator solution is to alkalescence;
(3) in above-mentioned mixed solution, add oxygenant, behind the reaction 60-120min, suction filtration, residue obtained oven dry is milled and is sieved, and obtains the heavy metal fixing agent.
The titanium dioxide waste residue contains FeSO described in the step (1)
47H
2O75-85wt%.
The concentration that contains ferrous ion in the ferrous iron solution described in the step (1) is 0.03-0.05mol/L.
The described phosphoric acid of step (2) or phosphate solution comprise phosphoric acid, calcium monohydrogenphosphate, monocalcium phosphate, potassium primary phosphate, and add-on is the mol ratio P/Fe=0.05-0.20 of phosphorus and iron.
The described alkali of step (2) is one or more of carbide slag, calcium hydroxide, potassium hydroxide; The described solution of step (2) is regulated 7＜pH≤9.
The described oxygenant of step (3) is that hydrogen peroxide, sodium chlorate, hypochlorous acid are received, in the liquid chlorine one or more, Fe
2+With the mol ratio of oxygenant be 1:0.8-2.
The described residue of step (3) is 50-80 ℃ of oven dry, and grinding is sieved, and screen size is 20 orders.
A kind of chemical fixatives for the heavy-metal contaminated soil reparation is the chemical fixatives that is prepared from by described method.
The application method of described chemical fixatives of repairing for heavy-metal contaminated soil, heavy-metal contaminated soil adds described fixing agent, adds tap water again, and quality is soil than scope: fixing agent: water=100:(4-6): (30-50), be stirred to evenly at least 14 days treatment times.Described heavy metal comprises Cd
2+, Pb
2+, Zn
2+In one or more.
The present invention has following advantage:
1. heavy metal fixing agent of the present invention is rich in hydroxyl functional group, with heavy metal cation (Cd
2+, Pb
2+, Zn
2+) etc., by surface adsorption with cooperate, under alkaline condition, form heavy metal precipitation, and further be combined with phosphate radical and form more stable compound, thereby strengthened the fixed effect of heavy metal.
2. main raw material of the present invention is that (what produce when namely producing titanium dioxide contains FeSO to the titanium dioxide waste residue
47H
2The waste residue of O) and carbide slag, be industrial solid castoff, raw material sources are extensive, with low cost, and provide new approach for the recycling of titanium white by product product and carbide slag.
3. main raw material of the present invention is titanium white by product product and carbide slag, phosphoric acid salt, and the principal element of the heavy metal fixing agent of preparation consists of iron, phosphorus, calcium, sulphur, and these elements are the necessary nutritive elements of plant.Therefore, the product application of the present invention's preparation is fixed in the heavy metal of contaminated soil, and non-secondary pollution is a kind of environmentally friendly heavy metal fixing agent.
Description of drawings
Fig. 1 is the sem photograph of heavy metal fixing agent of the present invention;
Fig. 2 is the EDAX figure of heavy metal fixing agent of the present invention;
Fig. 3 is the fixing agent for preparing under the pH=7.02 condition of the present invention fixed effect figure to Cd, Pb, Zn in the plumbous cadmium combined pollution soil;
Fig. 4 is the fixing agent for preparing under the pH=8.45 condition of the present invention fixed effect figure to Cd, Pb, Zn in the plumbous cadmium combined pollution soil.
Embodiment
Be intended to further specify the present invention below in conjunction with embodiment, and unrestricted the present invention.
The titanium dioxide waste residue is water-soluble, with its Fe of titration measuring
2+Content, and be mixed with 0.3molL
-1FeSO
4Solution, P/Fe=0.06 adds Ca (H in above-mentioned solution in molar ratio
2PO
4)
2Powder is stirred to dissolving fully; In above-mentioned mixed solution, add carbide slag supernatant fluid while stirring, regulate pH of mixed to 7.02; H in molar ratio in the gained mixed solution again
2O
2: Fe
2+=1.2:1 adds hydrogen peroxide, behind the reaction 90min, and vacuum filtration, the gained filter residue dries to constant weight in 60 ℃ of thermostat containers, pulverizes the back and crosses 20 mesh sieves, prepares the heavy metal-polluted soil fixing agent.Take by weighing the plumbous cadmium pollution soil of 100g, add the agent of 5g said fixing, add tap water according to native quality than 3:1, be stirred to evenly.Sampling in 1,2,5,7,14 day, measure available state Cd, Pb, Zn content (DTPA extraction agent attitude) in the soil respectively.After testing, soil available Cd fixed rate is 34% after 14 days.The fixed rate of soil available Pb is 41%.The fixed rate of soil available Zn is 94%.。
The titanium dioxide waste residue is water-soluble, with its Fe of titration measuring
2+Content, and be mixed with 0.3molL
-1FeSO
4Solution, P/Fe=0.08 adds phosphoric acid in above-mentioned solution in molar ratio, is stirred to dissolving fully; In above-mentioned mixed solution, add carbide slag supernatant fluid while stirring, regulate pH of mixed to 8.45; H in molar ratio in the gained mixed solution again
2O
2: Fe
2+=1.5:1 adds hydrogen peroxide, behind the oxidation 120min, and vacuum filtration, the gained filter residue dries to constant weight in 70 ℃ of thermostat containers, pulverizes the back and crosses 20 mesh sieves, prepares the heavy metal-polluted soil fixing agent.
Take by weighing the plumbous cadmium pollution soil of 100g, add the agent of 5g said fixing, add tap water according to native quality than 3:1, be stirred to evenly.Sampling in 1,2,5,7,14 day, measure available state Cd, Pb, Zn content (DTPA extraction agent attitude) in the soil respectively.After testing, soil available Cd fixed rate is 43% after 14 days.The fixed rate of soil available Pb is 48%.The fixed rate of soil available Zn is 95%.
Claims (10)
1. a preparation method who is used for the chemical fixatives of heavy-metal contaminated soil reparation is characterized in that, may further comprise the steps:
(1) with titanium dioxide waste residue dissolving water, is made into and contains ferrous iron solution;
(2) add in phosphoric acid and the phosphate solution one or more in the above-mentioned solution, add alkali while stirring, regulator solution is to alkalescence;
(3) in above-mentioned mixed solution, add oxygenant, behind the reaction 60-120min, suction filtration, residue obtained oven dry is milled and is sieved, and obtains the heavy metal fixing agent.
2. preparation method according to claim 1, it is characterized in that: the titanium dioxide waste residue contains FeSO described in the step (1)
47H
2O75-85wt%.
3. preparation method according to claim 1, it is characterized in that: the concentration that contains ferrous ion in the ferrous iron solution described in the step (1) is 0.03-0.05mol/L.
4. preparation method according to claim 1, it is characterized in that: the described phosphoric acid of step (2) or phosphate solution comprise phosphoric acid, calcium monohydrogenphosphate, monocalcium phosphate, potassium primary phosphate, add-on is the mol ratio P/Fe=0.05-0.20 of phosphorus and iron.
5. preparation method according to claim 1 is characterized in that: the described alkali of step (2) is one or more of carbide slag, calcium hydroxide, potassium hydroxide; The described solution of step (2) is regulated 7＜pH≤9.
6. preparation method according to claim 1 is characterized in that: the described oxygenant of step (3) is that hydrogen peroxide, sodium chlorate, hypochlorous acid are received, in the liquid chlorine one or more, Fe
2+With the mol ratio of oxygenant be 1:0.8-2.
7. preparation method according to claim 1, it is characterized in that: the described residue of step (3) is 50-80 ℃ of oven dry, and grinding is sieved, and screen size is 20 orders.
8. one kind is used for the chemical fixatives that heavy-metal contaminated soil is repaired, it is characterized in that, and be the chemical fixatives that is prepared from by each described method of claim 1-7.
9. the application method of the described chemical fixatives of repairing for heavy-metal contaminated soil of claim 8, it is characterized in that, heavy-metal contaminated soil adds described fixing agent, add tap water again, quality is soil than scope: fixing agent: water=100:(4-6): (30-50), be stirred to evenly at least 14 days treatment times.
10. application method according to claim 9 is characterized in that, described heavy metal comprises Cd
2+, Pb
2+, Zn
2+In one or more.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104338744A (en) * | 2014-10-10 | 2015-02-11 | 轻工业环境保护研究所 | Method for remediating heavy metal contaminated soil in situ |
| CN104399741A (en) * | 2014-10-22 | 2015-03-11 | 华南农业大学 | Method for fixing soil heavy metals so as to protect groundwater |
| CN105127194A (en) * | 2015-09-30 | 2015-12-09 | 太仓碧奇新材料研发有限公司 | Method for preparing titanium dioxide composite material for remedying farmland soil contaminated by phentriazophos |
| CN106190130A (en) * | 2016-07-06 | 2016-12-07 | 湖南恒凯环保科技投资有限公司 | A kind of heavy metal pollution of soil repairs stabilizer and application process thereof |
| CN106552806A (en) * | 2016-11-16 | 2017-04-05 | 湖南省园林建设有限公司 | Solid waste stacks field method for innocent treatment |
| CN106613138A (en) * | 2016-11-16 | 2017-05-10 | 西施生态科技股份有限公司 | Ecological restoration method of solid waste yards |
| CN108504360A (en) * | 2018-03-12 | 2018-09-07 | 湖南金旅环保股份有限公司 | A kind of pollution of vanadium place soil stabilization renovation agent and its methods for making and using same |
| CN109257986A (en) * | 2018-08-02 | 2019-01-25 | 成都制然环保科技有限公司 | A kind of environmental improvement module and its method of administration with slow release effect |
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| CN101716591A (en) * | 2009-12-08 | 2010-06-02 | 湖南省土壤肥料研究所 | Passivating method for reducing bioavailability of cadmium of acidic cadmium polluted soil |
| CN101862749A (en) * | 2009-04-14 | 2010-10-20 | 刘杰 | Repairing method of soil polluted by chromium residue |
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Patent Citations (2)
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| CN101862749A (en) * | 2009-04-14 | 2010-10-20 | 刘杰 | Repairing method of soil polluted by chromium residue |
| CN101716591A (en) * | 2009-12-08 | 2010-06-02 | 湖南省土壤肥料研究所 | Passivating method for reducing bioavailability of cadmium of acidic cadmium polluted soil |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104338744A (en) * | 2014-10-10 | 2015-02-11 | 轻工业环境保护研究所 | Method for remediating heavy metal contaminated soil in situ |
| CN104338744B (en) * | 2014-10-10 | 2016-05-18 | 轻工业环境保护研究所 | The method of in-situ remediation soil polluted by heavy metals |
| CN104399741A (en) * | 2014-10-22 | 2015-03-11 | 华南农业大学 | Method for fixing soil heavy metals so as to protect groundwater |
| CN105127194A (en) * | 2015-09-30 | 2015-12-09 | 太仓碧奇新材料研发有限公司 | Method for preparing titanium dioxide composite material for remedying farmland soil contaminated by phentriazophos |
| CN106190130A (en) * | 2016-07-06 | 2016-12-07 | 湖南恒凯环保科技投资有限公司 | A kind of heavy metal pollution of soil repairs stabilizer and application process thereof |
| CN106552806A (en) * | 2016-11-16 | 2017-04-05 | 湖南省园林建设有限公司 | Solid waste stacks field method for innocent treatment |
| CN106613138A (en) * | 2016-11-16 | 2017-05-10 | 西施生态科技股份有限公司 | Ecological restoration method of solid waste yards |
| CN108504360A (en) * | 2018-03-12 | 2018-09-07 | 湖南金旅环保股份有限公司 | A kind of pollution of vanadium place soil stabilization renovation agent and its methods for making and using same |
| CN109257986A (en) * | 2018-08-02 | 2019-01-25 | 成都制然环保科技有限公司 | A kind of environmental improvement module and its method of administration with slow release effect |
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|---|---|
| CN103275725B (en) | 2015-01-21 |
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Application publication date: 20130904 Assignee: Hunan Xishi ecological Polytron Technologies Inc Assignor: Central South University Contract record no.: 2015430000146 Denomination of invention: Chemical fixing agent for heavy metal contaminated soil remediation and preparation and application thereof Granted publication date: 20150121 License type: Exclusive License Record date: 20151117 |
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